（在进行任何更新之前，在上网本上使用 Ubuntu 10.04 LTS）无线工作正常，有线连接已使用 Windows 计算机进行了测试。
从电源管理器中选择 auto eth0 失败。
使用 Wicd 网络管理器 - 按连接到有线网络 - “连接”有线网络：正在获取 IP 地址... - 连接失败：无法获取 IP 地址
alex@alex-laptop:~$ ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:24:54:df:22:d5
inet6 addr: fe80::224:54ff:fedf:22d5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8558 errors:0 dropped:0 overruns:0 frame:0
TX packets:48 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:526280 (526.2 KB) TX bytes:9564 (9.5 KB)
Interrupt:18
在 eth0 上测试 dhclient
alex@alex-laptop:~$ sudo dhclient eth0
[sudo] password for alex:
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Listening on LPF/eth0/00:24:54:df:22:d5
Sending on LPF/eth0/00:24:54:df:22:d5
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 18
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
运行 dmesg
alex@alex-laptop:~$ dmesg | grep eth0
[ 1.092888] sky2 eth0: addr 00:24:54:df:22:d5
[ 13.521498] sky2 eth0: enabling interface
[ 13.522027] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 15.036628] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
[ 15.099270] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 21.505203] sky2 eth0: disabling interface
[ 21.516896] sky2 eth0: enabling interface
[ 21.517394] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 21.544054] sky2 eth0: disabling interface
[ 21.573775] sky2 eth0: enabling interface
[ 21.574326] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 23.085959] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
[ 23.086287] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 33.488031] eth0: no IPv6 routers present
[ 98.269052] sky2 eth0: disabling interface
[ 98.289665] sky2 eth0: enabling interface
[ 98.290176] ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 99.795289] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
[ 99.795826] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 110.272732] eth0: no IPv6 routers present
[ 133.463522] sky2 eth0: Link is down.
[ 7748.854103] sky2 eth0: Link is up at 100 Mbps, full duplex, flow control rx
运行 ifup
alex@alex-laptop:~$ sudo ifup eth0
[sudo] password for alex:
Ignoring unknown interface eth0=eth0.
运行lspci
alex@alex-laptop:~$ lspci | grep -i ethernet
09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller
alex@alex-laptop:~$ lshw -c Network | driver
WARNING: you should run this program as super-user.
No command 'driver' found, did you mean:
Command 'drivel' from package 'drivel' (universe)
driver: command not found
alex@alex-laptop:~$ lshw -c Network | grep driver
WARNING: you should run this program as super-user.
configuration: broadcast=yes driver=wl0 driverversion=5.60.48.36 latency=0 multicast=yes wireless=IEEE 802.11
configuration: broadcast=yes driver=sky2 driverversion=1.25 firmware=N/A latency=0 multicast=yes
跑步路线
alex@alex-laptop:/etc$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
link-local * 255.255.0.0 U 0 0 0 pan0
link-local * 255.255.0.0 U 0 0 0 eth1
我看到过建议/etc/dhcp3/dhclient.conf通过在 rfc3442 前面放置 # 来编辑文件并保存并重新启动，但这不起作用。
然后我尝试添加到/etc/network/interfaces 自动 eth0 iface eth0 inet dhcp。最初的接口文件是：
auto lo
iface lo inet loopback
我编辑为：
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
然后从启动中删除网络管理器，重新启动后这也没有帮助。任何想法为什么有线连接仍然无法工作？
答案1
您的第一个块表明您的本地网络上没有 DHCP 服务器。当你说网络接口在Windows下测试时是在这个网络上吗？如果是，只需复制设置即可。如果不是，请致电您的 ISP 以获取连接信息。可能需要一些 PPPoE 魔法，甚至需要提供您的 MAC 地址，以便他们能够使其获得 DHCP 配置。